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An off-duty Chicago police officer fatally shot a man around 6:45 a.m. in the 1800 block of West Monroe Street.

Updated at 6:23 AM EST on Monday, Sep 9, 2013

Three people were killed and at least 16 others were wounded in shootings across the city through Sunday night. Two of those injured were shot late Sunday along one of the Chicago Public Schools' Safe Passage Routes.

Officials say a black van pulled up to East 61st Street and South Champlain Avenue at about 10:45 p.m. Sunday, just behind Austin Sexton School, and someone inside started firing at two men who were standing on the street.

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Two men, ages 23 and 29, were both shot multiple times and taken to John H. Stroger Jr., Hospital of Cook County. At a check early Monday morning, the 23-year-old was listed in critical condition. An update on the 29-year-old's condition was not available.

Off-Duty Officer Shoots Teen Intruder

At around 4:45 a.m. Sunday, a 34-year-old man was shot multiple times in the leg and chest.

Police said a shooter approached the man's vehicle in the 3900 block of West Wilcox Street and fired several shots. He was transported to Mount Sinai Hospital in critical condition and no one was in custody as of Sunday morning.

Less than an hour earlier, a 24-year-old man was shot in the 5500 block of South Mozart Street. The man was taken in critical condition to Mount Sinai Hospital with wounds to the lower back and buttocks, according to Chicago Police News Affairs Officer John Mirabelli.

Details surrounding the shooting were not immediately available, but police said the incident appears to be gang-related.

Around 2:50 a.m., three people were shot while sitting on their porch in the Roseland neighborhood.

Authorities said a light-colored vehicle drove up to the porch and fired several shots.

A 27-year-old woman was taken in stable condition to Roseland Hospital with a gunshot wound to the foot, a 19-year-old woman was shot in the right hand and also taken to Roseland Hospital and a 25-year-old man was taken to Advocate Christ Medical Center in critical condition with wounds to the left leg and abdomen.

No one was in custody for the shooting as of Sunday morning, Mirabelli said.

On Saturday, a 19-year-old man was shot in the hand and treated at Stroger Hospital, officials said.

The man said he was shot in the 6800 block of South Champlain Avenue, but police said the wound appears to be self-inflicted.

At 7:05 a.m. Saturday, police said they responded to a call of a man down in the 5100 block of North Ellsworth Drive. A man in his 20s was found shot in the head and was pronounced dead at University of Chicago Hospital, according to Chicago police News Affairs Officer Michael Sullivan.

Another fatality took place around 6:45 a.m. in the 1800 block of West Monroe Street, according to Chicago Police News Affairs Officer Michael Sullivan.

The shooting took place around 6:45 a.m. in the 1800 block of West Monroe Street, according to Chicago Police News Affairs Officer Michael Sullivan.

According to a statement from Chicago Police, the off-duty officer was working a part-time job as a security guard at the Chicago Housing Authority building when he observed a female guard in a physical altercation with a male offender attempting to gain access to the property and shot at him.

Less than an hour earlier, a teen was left in serious condition after he was shot near 26th Street and Lawndale Avenue.

Police said the man was hanging out of the rear window of a car shouting gang slogans at a group when someone from the group shot him.

He was taken to Mount Sinai Hospital with a gunshot wound to the back.

Around 2:20 a.m. police said a 22-year-old man was shot in the chest and buttocks in the 7800 block of South Shore Drive.

Police said the shooter was refused entry into a house party and began firing into the house, striking the victim.

He was taken to Advocate Christ Medical Center in critical condition.

Just before 2 a.m., a man was shot in the face near the United Center on the city’s near west side.

The man was shot in the 2100 block of West Van Buren Street, but no further details were immediately available, Sullivan said.

Around the same time, a police officer shot someone in the 6300 block of South King Drive.

Police said the officers observed a man firing shots at an unknown target and when they approached him, the man turned towards the officers with his weapon raised.

Officers fired at the man and struck him in the leg.

The man was taken to an area hospital with non-life threatening injuries and was placed into police custody.

No others were injured in the incident and the Independent Police Review Authority is investigating.

Around midnight, an 18-year-old woman was shot in the 3000 block of South Tripp Avenue, police said.

The woman suffered a gunshot wound to the upper right arm and transported herself to Loretto Hospital.

No one was in custody for her shooting as of Saturday morning, officials said.

On Friday, three people were injured while sitting on their porch in the Roseland neighborhood, authorities said.

Late Friday, two men were shot in the Wicker Park neighborhood after police said two groups of people began attacking each other. Witnesses reported hearing between six and 10 gunshots in the 1400 block of North Damen Avenue.

The two wounded men were taken to area hospitals in stable condition, officials said.

On Monday morning, Chicago police officials tried to put the violence into context, providing numbers which said citywide shootings are down 22 percent year-to-date over last year.

"While there has been far less crime, far fewer shootings and far fewer murders this year, one victim is one too many and certainly more work remains," said department spokesman Adam Collins. "We will continue to partner with the community and implement our comprehensive policing strategy, but to reduce violence for the long-term our state needs better laws that keep illegal guns out of our communities and punish the criminals who carry them."